diff --git a/pkg/build/build.go b/pkg/build/build.go
index 06232a6..d8e2319 100644
--- a/pkg/build/build.go
+++ b/pkg/build/build.go
@@ -36,6 +36,7 @@ type Build struct {
 	TmpWorkingDir string                    // the working directory in the temporary directory, which is corresponding to the current directory in the project directory
 	IsMod         bool                      // determine whether it is a Mod project
 	Root          string
+	// go 1.11, go 1.12 has no Root
 	// Project Root:
 	// 1. legacy, root == GOPATH
 	// 2. mod, root == go.mod Dir
diff --git a/pkg/build/tmpfolder.go b/pkg/build/tmpfolder.go
index b8f227e..166035e 100644
--- a/pkg/build/tmpfolder.go
+++ b/pkg/build/tmpfolder.go
@@ -48,7 +48,9 @@ func (b *Build) MvProjectsToTmp() {
 	}
 	// fix #14: unable to build project not in GOPATH in legacy mode
 	// this kind of project does not have a pkg.Root value
-	if b.Root == "" {
+	// go 1.11, 1.12 has no pkg.Root,
+	// so add b.IsMod == false as secondary judgement
+	if b.Root == "" && b.IsMod == false {
 		b.NewGOPATH = b.OriGOPATH
 	}
 	log.Printf("New GOPATH: %v", b.NewGOPATH)
@@ -90,7 +92,7 @@ func (b *Build) mvProjectsToTmp() error {
 	// 1. a legacy project, but not in any GOPATH, will cause the b.Root == ""
 	if b.IsMod == false && b.Root != "" {
 		b.cpLegacyProject()
-	} else if b.IsMod == true && b.Root != "" {
+	} else if b.IsMod == true { // go 1.11, 1.12 has no Build.Root
 		b.cpGoModulesProject()
 	} else if b.IsMod == false && b.Root == "" {
 		b.TmpWorkingDir = b.TmpDir